ISL12022IBZ-T

Real Time Clock Overview

The ISL12022IBZ-T is a low-power Real-Time Clock (RTC) and calendar integrated circuit manufactured by Renesas Electronics. It features an I2C serial interface and includes 128 bytes of battery-backed SRAM for data storage. The device operates within a supply voltage range of 2.7 V to 5.5 V and supports a backup voltage as low as 1.8 V. It provides accurate timekeeping with embedded temperature compensation, achieving a frequency stability of ±5 ppm over the industrial temperature range of -40°C to +85°C. The component is housed in an 8-lead SOIC package.

Real Time Clock Feature Summary

• Integrated temperature-compensated crystal oscillator providing ±5 ppm accuracy from -40°C to +85°C
• 128-bit battery-backed SRAM for non-volatile data retention
• I2C bus interface supporting standard and fast mode operations
• Automatic Daylight Saving Time adjustment and leap year compensation

Real Time Clock Applications

• Utility meters requiring precise long-term timekeeping
• Industrial control systems needing reliable clock sources
• Portable devices utilizing low-power RTC functionality

Real Time Clock Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when sourcing. Confirm that the operating environment remains within the specified -40°C to +85°C range to maintain the guaranteed ±5 ppm accuracy. Ensure I2C bus pull-up resistors are selected appropriately for the system voltage level.

Real Time Clock Selection Notes

Select this component when high precision is required without external trimming capacitors due to the internal temperature compensation. It is suitable for designs needing both real-time tracking and small-scale data storage via the integrated SRAM. Verify compatibility with the target I2C address configuration before integration.

Real Time Clock Part Context

This part belongs to the ISL12022 series of real-time clocks. It serves as a drop-in replacement for older Intersil RTCs in applications demanding higher accuracy than standard quartz oscillators provide. The technology integrates the crystal and compensation circuitry on-chip to reduce board space and improve reliability.

Real Time Clock Replacement Considerations

Check pinout compatibility if replacing legacy RTCs. Verify that the I2C communication protocol matches the host controller's expectations. Ensure the power supply rails support the 2.7V minimum requirement for proper operation.